I think this doesn’t work even with time-ordering. A spam bot will probably get to the post first in any case. A bot that simply upvotes everything will gain a huge amount of trust. Even a bot paid only to upvote specific posts will still gain trust if some of those posts are actually good, which it can “use” to gain credibility in its upvotes for the rest of the posts (which may not be good).
I think this doesn’t work even with time-ordering. A spam bot will probably get to the post first in any case. A bot that simply upvotes everything will gain a huge amount of trust. Even a bot paid only to upvote specific posts will still gain trust if some of those posts are actually good, which it can “use” to gain credibility in its upvotes for the rest of the posts (which may not be good).